What does a Conservative prime minister get for standing up to the European Union? A welcome bounce in the polls.

Two surveys carried out since David Cameron blocked a new EU treaty at a European summit in Brussels last week show the center-right and traditionally euro-skeptic Conservative Party are ahead of the main center-left Labour Party in voter intentions for the first time this year.

A Reuters/Ipsos MORI Political Monitor poll, based on a phone survey of 1,001 adults across the U.K. on 10-12 December, show the Conservatives have jumped seven percentage points since the last monthly poll to 41% while Labour have dipped two to 39%.

The latest YouGov poll for the Sun newspaper, carried out among 1,704 adults on Monday and Tuesday, also shows the Conservatives on 41% and Labour on 39% — the first time Cameron’s party has been ahead of Labour on this survey since December 2010.